Core or mandrel.



w. F. RAY. cone 0R MANDREL. A PPUCATION FILED JULY 20. 1917- Patented Dec. 18.1917.

wI-LLInmr. RAY, or oHIoAeq LLmoIsj ma s mama 7 To all whom it may concern:

to provide a sectionally constructed a-iinu lar core which is simple, cheap and durable and which can be removed great facility from the tire or interhner after the carcass has been built upon the core the vulcanizing' operation effected;

The invention is illustrated in its pre ferred embodiment in the accompanying drawing, in whichi.

Figure 1 represents a plan view of a sectionally constructed core'embodying myin- 'vention; Fig. 2, a broken perspective view showing one entremityof the main section of the core; Fig. 3, a. broken -perspective view'showing one end of the "detachable core-section and the locking :means' with which it is equipped; and Fig. 4, a broken sectional view illustrating the manner in which the extremities of the removable or minor section of the core is interlockingly engaged with the major section ofthe care.

In the construction illustrated, A repre sents the major section of the improved annular core or mandrel; and A the detachable minor section.

The core-sections are preferably formed of cast metal, machined to present the desired cross-sectional contour.

The core illustrated is of proper design for use in the manufacture of-interliners for tires. Preferably, the main or major section A is of integral formation and comprises two-thirds or more of the annulus. Each extremity of the memberA is proided with plane surfaces 1 and 2 which are oflset with relation to each other or he in different planes, which, however, may be parallel planes. These surfaces are intersected by a plane surface 3 forming an acute angle with each of the planes 1 and 2, thus providing an undercut or notch 4; that is, each extremity of the main core-section A is provided with a rentrant angle, indicated at &.

Application rh a Jur -2o, 1917:. Serial in; $1,693,

. extend flu sh.

'sn'eeifi tieii mar r tenil Patented Deo. 1 8 ,i9i12.

AS indicated in Fig. 1, the planes of the surfaces 1. conyerge"somewhat in an out? warddirection; and'lthesame is true of the planes ofthe'surfaces 2, the purpose beto enable the? detachable section A to easily and quickly free itse'lf whenSaidsection islmov'e'd inwardly. to a position indicated dotted lines in Fig. l. At nine dian' point,guide' tenons '5 are provided on the surfaces 1 of the main core-section; and, further'inwardly, the surfaces? are pro vided withsockets 6" adapted to' receive the lockingfpins with which the detachable-sec tion 1 is-e'quip'pe'd. j

The relatively small core-section -A is pro idedwithsurfaces 1? and 2? which are comp'lem'ental to, or correspond; with" the surfaces 1 and? of the'main section {and the surfaces 'l 'and 2 are intersected'by a sur face 3 which is @0mp1ementa1flt0; the surface 3. As thus described, the extremities annulus and which guides open atthe center portion of the surfaces 2". The locking studs 6 may be manipulated by means of radial projections 8 whose inner ends are firmly secured to the locking studs. The lugs or projections 8 are adapted to work in radial slots 9 which intersect the guides 7.

In the use of the improved core, the detachable section A is firmly secured in the position indicated by the full lines in Fig.

l and as shown in the sectional view in Fig. Y

4:. The carcass of the interliner is built upon the core or mandrel in the usual manner, it

being usual to have the edges of the fabric, or certain plies of the fabric, entering into the construction of the with the lines 10 at the inner circumference of the core. After the vulcanizing operation, the locking studs 6 may be disengaged from the socket 6 by tapping upon the lugs 8 which project through the slot at the inner circumference of the interliner. \Vhen this is effected, the section A may be tapped inwardly and removed interliner,

from the interliner, after which the interliner may be readily stripped from the main section of the core. It is to be observed that the improved core preferably comprises only two sections, and the extremities of the two core-sections are so interlocked as to mutually brace each other against expan sion of the annulus. This results from the undercut notches and projections employed at the meeting extremities of the core-sections, and is supplemented by the disposition of the locking studs 6 and the manner in which they enter the sockets 6.

The construction described is simple, cheap, thoroughly durable and easily manipulated. It may be noted, also, that the construction provides an unobstructed or substantially continuous inner surface for the core or mandrel, so that the mandrel may be readily secured upon a suitable tripod or base to facilitate the operation of building up the carcass upon the core.

The foregoing detailed description has been given for clearness of understanding only and no unnecessary limitation should be understood therefrom, but the appended claims should be construed as broadly as is permissible in view of the prior art.

WVhat I regard as new and desire to secure by Letters Patent is- 1. An annular core comprising two sections only, one of said sections being relatively short,,said sections having extremities provided with offset surfaces which converge somewhat outwardly and intersecting surfaces forming interlock notches adapted to resist expansion of the core and substantially tangentially slidable locking studs connecting the extremities of the sections.

2. An annular core comprising two sections only, one section being a relatively short section, said sections being provided 8. An annular core comprising a main 7 section, each of whose extremities is provlded with a paireof surfaces which are ofiset from each other and 1ntersected by a connecting surface, the upper or outer surface being equipped with a guide tenon and r the inner surface being equipped with a socket, and a complemental smaller section first-named surfaces and provided with guide grooves, said smaller section being equipped with tangentially movable locking devices adapted to engage the sockets in the extremities of the main section.

4. An annular core, comprising a short section having plane end-surfaces which are offset and convergent and having also intersecting plane surfaces forming interlock notches, a. complemental annulus portion having corresponding convergent offset plane surfaces and intersecting plane surfaces forming interlock notches, tenon and groove connections between said surfaces, and substantially tangentially movable looking bolts mounted in guides open at the ends of said short sections and having actuating lugs movable in slots opening at the inner circumferential surface of said short section.

' WILLIAM F. RAY.

Copies of this patent may be obtained for five cents each, byadflressing the Commissioner of Patents. Washington, D, C.

having surfaces corresponding withsaid 

